code: def convert_expr(expr):
      return convert_add(expr.additive())
  
imports: from importlib.metadata import version
  import sympy
  from sympy.external import import_module
  from sympy.printing.str import StrPrinter
  from sympy.physics.quantum.state import Bra, Ket
  from .errors import LaTeXParsingError
label_desc: Use image node_id 3 for calling a global function with example usage: convert_expr(expr) and returns: convert_add